Late payment interest calculator
What you can claim on a late invoice to another UK business. Free, no sign-up, nothing leaves your browser.
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The base rate changes, so check the current one on the Bank of England website. Legally the rate to use is the base rate on 30 June or 31 December before the invoice fell due.
Showing 8% only until you add the base rate.
What the law lets you claim
The Late Payment of Commercial Debts (Interest) Act 1998 lets a business charge interest on a late invoice to another business at 8% a year plus the Bank of England base rate, unless your contract agreed a different rate. Interest runs daily from the day after payment was due.
You can also claim a fixed sum per invoice for the cost of chasing it: £40 if the debt is under £1,000, £70 from £1,000 to £9,999.99, and £100 for £10,000 or more.
When it doesn't apply
It covers business-to-business invoices only, not sales to consumers. If your contract sets its own late payment terms, those usually apply instead. This page is a calculator, not legal advice.
Getting paid on time next time
Invoices with a pay-by-card link get paid faster than ones asking for a bank transfer, because the customer can pay the moment they open it.
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